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<body class="container">
    <h3 align="center">垂直方向浮动布局</h3>
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        <div class="mb-auto p-2 bg-primary">家用电器</div>
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        <div class="p-2 bg-primary">家用电器</div>
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        <div class="mt-auto p-2 bg-danger">男装女装</div>
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